Green’s Dictionary of Slang

spicer n.

[spice v.2 ]

(UK Und.) a robber, a footpad.

[UK]H.T. Potter New Dict. Cant (1795) n.p.: spicer a petty thief – a footpad.
[UK]G. Andrewes Dict. Sl. and Cant.
[UK]Flash Dict.
[UK]G. Kent Modern Flash Dict.
[UK]Flash Dict. in Sinks of London Laid Open.
[US]Matsell Vocabulum.